Gypsum is used for________________?

Related Mcqs:

1. The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate is_______________?

   A. Alpha – hemihydrates
   B. Beta – hemihydrates
   C. Calcium sulphate dihydrate
   D. Orthorhombic anhydrate

2. Accelerators and retarders are used with gypsum products mainly to control_______________?

   A. Setting time
   B. Setting expansion
   C. Hardness of the set product
   D. None of the above

3. The most commonly used accelerator in gypsum product is___________________?

   A. Sodium fluoride
   B. Potassium fluoride
   C. Potassium sulfate
   D. Aluminium sulfate

4. The β (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________?

   A. They are more regular in shape and dense
   B. They are more regular in shape and highly porous
   C. They are more irregular in shape and porous
   D. They are more dense and prismatic in shape

5. Modiffiers are added to gypsum mainly to_______________?

   A. Modify setting time
   B. Modify setting expansion
   C. Modify strength
   D. Decrease the porosity

6. ADA specification number of gypsum products are described under____________?

   A. 1
   B. 4
   C. 12
   D. 25

7. Type III Dental gypsum is__________________?

   A. Class II stone
   B. Densite
   C. Class I stone or hydrocal
   D. Model or lab plaster

8. As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?

   A. 0.05
   B. 0.10
   C. 0.15
   D. 0.20

9. Gypsum product having least expansion_____________?

   A. Impression plaster
   B. Model plaster
   C. Stone plaster
   D. Die stone

10. The setting expansion of gypsum products can be reduced by________________?

    A. Increased spatulation
    B. Adding potassium sulfate
    C. Less water powder ratio
    D. Allowing setting under water